114 



KANSAS UNIVERSITY QUARTERLY, 



Actual dist. both (assisted). 

 Actual distance. 



Right eye. 

 Left eye. 

 Both eyes, 



Hi 3 



lOH 15. 13^ 15 



Comparing the sum of the actual distances (82 12 m. ), shown in 

 table III, with the sums of the estimates in columns \^l), (II) and 

 (III), the order of accuracy is shown as follows: 



Real Distance. Right Eye. Left Eye. Both, unassisted. 



82>4 72.35 71-325 67.7375 



A previous experiment was made in nearly the same manner as 

 this one, except that no distance greater than 10 meters was shown 

 (instead of 15, as in this), and that a greater number of subjects 

 were used with fewer tests each, and finally, that instead of giving 

 the tests in the order of right eye, left eye and both eyes, it was 

 given in this order: both eyes, right eye and left eye; so the order 

 of giving the tests could not have influenced the results of the two 

 experiments to be similar to each other. 



The averages of the results obtained from the preceding experi- 

 ment were as follows: 



Real Distance. Right Eye. Left Eye. Botli. unassisted. 



9214 87.96^ 86.03^ 79-72>< 



Simplifying these two sets of results by reducing the real dis- 

 tances (82^ and 92}4) to unity, we have the following compari- 

 sons: 



Estimations. 



Real Distance. Right. Left. Both. 



For 15 meters, i meter. .87 .86 .82 



For 10 meters, i meter. .95 .93 .86 



These figures show the accuracy of judgment to be greater within 

 a scope of 10 meters than 15, which might have been expected, 

 since in the curve in diagram I the oblique lines representing the 

 relative judgments, diverge more and more from the true line as 

 the distance increases. This is better shown below: 



